Once per Duel, you can discard 1 card to Fusion Summon 1 Ancient Gear Fusion Monster from your Extra Deck, using monsters from your field as Fusion Material. If 1 of those materials is an Ancient Gear Golem monster, you can also use monsters from your hand and or Deck as the other material. Your opponent takes no damage for the rest of this turn. Any battle damage your opponent takes from that Fusion Monster is halved.